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Prepare PV's with
pvcreate /dev/<device>
For FC LUN's use /dev/mapper/mpath<x> according to Red Hat DM Multipath Configuration & Administration
Create VG
vgcreate <vgname> -s <PE size> <path to PV>
Create LV
lvcreate --name <lvname> --size <xx>G <vgname>
Create filesytem
mkfs.ext4 -F -b 4096 /dev/<vgname>/<lvname>
Depending on distribution use relevant ext2/ext3/ext4 file system type.
Resize Physical Volume
pvresize /dev/<device>
Extend Logical Volume
lvextend -l 100%VG <lvname>
check man lvextend for further options
Extend filesytem which resides on Logical Volume
resize2fs /dev/<vgname>/<lvname>